package org.oschina.util;

import javax.servlet.http.HttpServletRequest;

public class HttpUtil {

	/**
	 * 获得IP
	 * @return
	 */
	public static String getIp(HttpServletRequest request)
	{
		String ip=request.getHeader("x-forwarded-for");
		if(ip==null || ip.length()==0 || "unknown".equalsIgnoreCase(ip))
		{
			ip=request.getHeader("Proxy-Client-IP");
		}
		
		if(ip==null || ip.length()==0 || "unknown".equalsIgnoreCase(ip))
		{
			ip=request.getHeader("WL-Proxy-Client-IP");
		}
		
		if(ip==null || ip.length()==0 || "unknown".equalsIgnoreCase(ip))
		{
			ip=request.getRemoteAddr();
		}
		return ip;
	}
}